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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
// Select appropriate OpenVPN protocol data channel implementation
#ifndef OPENVPN_CRYPTO_CRYPTODCSEL_H
#define OPENVPN_CRYPTO_CRYPTODCSEL_H
#include <openvpn/common/exception.hpp>
#include <openvpn/crypto/cryptodc.hpp>
#include <openvpn/crypto/crypto_chm.hpp>
#include <openvpn/crypto/crypto_aead.hpp>
#include <openvpn/crypto/crypto_aead_epoch.hpp>
#include <openvpn/random/randapi.hpp>
namespace openvpn {
OPENVPN_EXCEPTION(crypto_dc_select);
/**
* Implements the data channel encryption and decryption in userspace
*/
template <typename CRYPTO_API>
class CryptoDCSelect : public CryptoDCFactory
{
public:
typedef RCPtr<CryptoDCSelect> Ptr;
CryptoDCSelect(SSLLib::Ctx libctx_arg,
const Frame::Ptr &frame_arg,
const SessionStats::Ptr &stats_arg,
const StrongRandomAPI::Ptr &rng_arg)
: frame(frame_arg),
stats(stats_arg),
rng(rng_arg),
libctx(libctx_arg)
{
}
CryptoDCContext::Ptr new_obj(CryptoDCSettingsData dc_settings) override
{
const CryptoAlgs::Alg &alg = CryptoAlgs::get(dc_settings.cipher());
if (alg.flags() & CryptoAlgs::CBC_HMAC)
return new CryptoContextCHM<CRYPTO_API>(libctx, std::move(dc_settings), frame, stats, rng);
else if (alg.flags() & CryptoAlgs::AEAD && dc_settings.useEpochKeys())
return new AEADEpoch::CryptoContext<CRYPTO_API>(libctx, std::move(dc_settings), frame, stats);
else if (alg.flags() & CryptoAlgs::AEAD)
return new AEAD::CryptoContext<CRYPTO_API>(libctx, std::move(dc_settings), frame, stats);
else
OPENVPN_THROW(crypto_dc_select, alg.name() << ": only CBC/HMAC and AEAD cipher modes supported");
}
private:
Frame::Ptr frame;
SessionStats::Ptr stats;
StrongRandomAPI::Ptr rng;
SSLLib::Ctx libctx;
};
} // namespace openvpn
#endif
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